Giovedì 9 maggio 2024 - Ore 15:00 - Aula Magna
Prof. Renaud Nicolaÿ
Molecular, Macromolecular Chemistry and Materials (C3M), UMR 7617, ESPCI Paris, PSL University, CNRS
  Seminario  

Vitrimers are chemically crosslinked networks that can rearrange their topology without decreasing their crosslinking density thanks to exchangeable links present in the network. As a result, vitrimers can be potentially reshaped and recycled at will, while displaying the superior properties of crosslinked polymers at service temperature. Very promising materials to create a circular economy of plastics and polymeric materials, vitrimers still display limitations that impact their transition towards industry, such as high viscosity even at elevated temperatures, due to the Arrhenian temperature dependence of the melt viscosity, or moderate creep resistance at working temperatures in the case of low Tg materials. Although many strategies have been reported to address these issues, it remains challenging to overcome a key trade-off between improving the processability or the mechanical performance of vitrimers. In this lecture, new strategies based on phase separation and reactive processing will be presented to jointly improve the processability and the mechanical performance of vitrimers relying on dioxaborolane metathesis.